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Dendrokronologija črnega bora (Pinus nigra Arnold) na območju zahodnega dela Balkanskega polotoka : doktorska disertacija
ID Poljanšek, Simon (Author), ID Levanič, Tom (Mentor) More about this mentor... This link opens in a new window, ID Kadunc, Aleš (Reviewer), ID Gričar, Jožica (Reviewer)

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PID: 20.500.12556/rul/f1bc454d-ded1-44b6-8329-8248aed5c6ab

Abstract
Za območje osrednjega dela areala črnega bora (Pinus nigra Arnold) na zahodnemdelu Balkanskega polotoka je bila iz sedmih medsebojno ujemajočih se lokalnih kronologij širin branik izračunana prva regionalna kronologija. Dodatno so bili letni debelinski prirastki vzorčeni na severovzhodnem ter severozahodnem robu razširjenosti bora na Balkanskem polotoku. Slednja lokacija se nahaja v submediteranskem delu Slovenije, tu sta bili izmerjeni tudi gostoti ranega in kasnega lesa. Izdelana regionalna kronologija širin branik črnega bora se ujema s predhodno objavljenimi regionalnimi kronologijami sosednjih območij. Na širino branik dreves z območja submediteranskega dela Slovenije negativno vplivajo nadpovprečne poletne temperature, na gostoto ranega lesa pa imajo pozitiven vpliv zgodnje poletne padavine. V Bosni in Hercegovini (BiH), kjer je trajanje sončnega obsevanja predstavljeno kot posredni kazalnik vlažnostnega stresa, je bil odkrit na širino branik značilni negativni vpliv trajanja sončnega obsevanja obdobja junijjulij. Medtem je bila na severovzhodni meji balkanskega dela areala, v jugozahodni Romuniji, izračunana značilna korelacija med širino branik in standardiziranim padavinskim indeksom obdobja junij-avgust. Vpliv klime na širino branik črnega bora z območja BiH je stabilen do sredine druge polovice 20. stoletja, potem je klimatski signal oslabljen. Najverjetnejši vzrok za šibkejši klimatski signal so značilne spremembe v ciklonih nad Balkanskim polotokom in s tem manjši sušni stres za drevesa. Trajanje sončnega obsevanja je rekonstruirano do leta 1660, padavinski indeks pa do leta 1688. Značilna leta, prepoznana s preseganjem izbranih mejnih vrednosti rekonstrukcije, so bila pojasnjena z drugimi objavljenimi in neobičajnimi dogodki, ki vplivajo narast: sušami, poletnimi deževji, hladnimi poletji in vulkanskimi izbruhi.

Language:Slovenian
Keywords:Balkanski polotok, dendrokronologija, branike, prirastek lesa, okoljski dejavniki, suša, temperatura, padavine
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:BF - Biotechnical Faculty
Publisher:[S. Poljanšek]
Year:2013
Number of pages:VII, 101, [36] str.
PID:20.500.12556/RUL-76710 This link opens in a new window
UDC:551.583.4:630*174.75(497)(043.3)
COBISS.SI-ID:773495 This link opens in a new window
Publication date in RUL:30.12.2015
Views:2204
Downloads:383
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Secondary language

Language:English
Title:Dendrochronology of black pine (Pinus nigra Arnold) in the western part of the Balkan peninsula
Abstract:
For the central part of the black pine (Pinus nigra Arnold) distribution area on the Balkan Peninsula, seven site chronologies were developed, which match each other and form the first regional tree-ring width chronology. Regional chronology matches the published regional chronologies from the neighbouring regions. Additionally, one site each in north-eastern and north-western marginof the black pine distribution on the Balkan Peninsula was sampled. The north-western site is located in sub-Mediterranean Slovenia where, additionally, the density of early- and latewood was measured. Here has mean summer temperature negative influence on the tree-ring widths, while early summer precipitation positively affects the earlywood density. In Bosnia and Herzegovina (BiH), moisture stress was associated with sunshine hours, and statistically significant influence of June-July sunshine hours on the tree-ring widths was discovered. In the north-eastern margin of the black pinedistribution from the Balkan Peninsula, in the south-western part of Romania, statistically significant correlation between tree-ring widths and standardized precipitation index from the June-August period was calculated. Climate signal in tree-ring widths from BiH area is stable till the second half of the 20th century, while later on the signal weakens. The most plausible reason is the difference in cyclones over the Balkan Peninsula and reduced drought stress for trees. Sunshine hours were reconstructed back to the year 1660, and precipitation index back to 1688. The extreme years, identified with thresholds and reconstructions, were recognized with the aid of previously published and archived unusual events: droughts, floods, cool summers and volcanic eruptions.


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